US5281403B1 - Method for converting urea to ammonia - Google Patents

Method for converting urea to ammonia Download PDF

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Publication number
US5281403B1
US5281403B1 US76685391A US5281403B1 US 5281403 B1 US5281403 B1 US 5281403B1 US 76685391 A US76685391 A US 76685391A US 5281403 B1 US5281403 B1 US 5281403B1
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United States
Prior art keywords
ammonia
converting urea
urea
converting
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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Dale G Jones
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NOELL Inc A Corp OF DELAWARE
Noell Inc
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NOELL Inc A Corp OF DELAWARE
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Priority to US07766853 priority Critical patent/US5281403B1/en
Assigned to NOELL, INC. A CORPORATION OF DELAWARE reassignment NOELL, INC. A CORPORATION OF DELAWARE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JONES, DALE G.
Publication of US5281403A publication Critical patent/US5281403A/en
Priority to US08/598,092 priority patent/US5827490A/en
Application granted granted Critical
Publication of US5281403B1 publication Critical patent/US5281403B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/04—Preparation of ammonia by synthesis in the gas phase
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
    • C01C1/00—Ammonia; Compounds thereof
    • C01C1/02—Preparation, purification or separation of ammonia
    • C01C1/08—Preparation of ammonia from nitrogenous organic substances
    • C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
US07766853 1991-09-27 1991-09-27 Method for converting urea to ammonia Expired - Fee Related US5281403B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US07766853 US5281403B1 (en) 1991-09-27 1991-09-27 Method for converting urea to ammonia
US08/598,092 US5827490A (en) 1991-09-27 1996-02-07 Method for converting urea to ammonia

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07766853 US5281403B1 (en) 1991-09-27 1991-09-27 Method for converting urea to ammonia

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13919293A Division 1991-09-27 1993-10-19

Publications (2)

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US5281403A US5281403A (en) 1994-01-25
US5281403B1 true US5281403B1 (en) 1996-06-11

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US07766853 Expired - Fee Related US5281403B1 (en) 1991-09-27 1991-09-27 Method for converting urea to ammonia
US08/598,092 Expired - Fee Related US5827490A (en) 1991-09-27 1996-02-07 Method for converting urea to ammonia

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US08/598,092 Expired - Fee Related US5827490A (en) 1991-09-27 1996-02-07 Method for converting urea to ammonia

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Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5431893A (en) * 1992-02-24 1995-07-11 Hug; Hans T. Cleaning exhaust gases from combustion installations
US5585072A (en) * 1995-01-27 1996-12-17 The Babcock And Wilcox Company Retractable chemical injection system
WO1997036676A1 (en) * 1996-04-02 1997-10-09 Clean Diesel Technologies, Inc. Method and apparatus for reducing harmful emissions from a diesel engine by urea injection scr
US5681536A (en) * 1996-05-07 1997-10-28 Nebraska Public Power District Injection lance for uniformly injecting anhydrous ammonia and air into a boiler cavity
WO1998022209A1 (en) * 1996-11-20 1998-05-28 Clean Diesel Technologies, Inc. SELECTIVE CATALYTIC NOx REDUCTION UTILIZING UREA WITHOUT CATALYST FOULING
WO1998028070A1 (en) * 1996-12-20 1998-07-02 Clean Diesel Technologies, Inc. Method and apparatus for reducing harmful emissions from a lean-burn engine by urea injection scr
WO1998042623A1 (en) * 1997-03-21 1998-10-01 Ec&C Technologies Methods for the production of ammonia from urea and uses thereof
WO1998043732A1 (en) * 1997-04-02 1998-10-08 Clean Diesel Technologies, Inc. REDUCING NOx EMISSIONS FROM AN ENGINE BY TEMPERATURE-CONTROLLED UREA INJECTION
US5943858A (en) * 1995-05-19 1999-08-31 Siemens Aktiengesellschaft Premixing chamber for an exhaust gas purification system
US6093380A (en) * 1998-10-16 2000-07-25 Siirtec Nigi, S.P.A. Method and apparatus for pollution control in exhaust gas streams from fossil fuel burning facilities
US6146605A (en) * 1999-07-26 2000-11-14 Hera, Llc Combined SCR/SNCR process
US20010018034A1 (en) * 2000-02-28 2001-08-30 Satoshi Wakasa Ammonia generating apparatus
US20010018033A1 (en) * 2000-02-28 2001-08-30 Satoshi Wakasa NOx removal system for boilers
US6361754B1 (en) * 1997-03-27 2002-03-26 Clean Diesel Technologies, Inc. Reducing no emissions from an engine by on-demand generation of ammonia for selective catalytic reduction
US6403046B1 (en) 1999-07-26 2002-06-11 Hera, Llc Pollution control systems using urea and ammonia for the control of emissions from the flue gas of fossil fuel burning facilities
US6436359B1 (en) 2000-10-25 2002-08-20 Ec&C Technologies, Inc. Method for controlling the production of ammonia from urea for NOx scrubbing
WO2002092512A1 (en) * 2001-05-16 2002-11-21 The Chemithon Corporation Processes and apparatus for quantitatively converting urea to ammonia on demand
US6511644B1 (en) 2000-08-28 2003-01-28 The Chemithon Corporation Method for removing contaminants in reactors
US20040006911A1 (en) * 2002-07-12 2004-01-15 Hudson Dannie B. Dual homogenization system and process for fuel oil
US6713031B2 (en) * 2000-05-10 2004-03-30 Dmc2 Degussa Metal Catalysts Cerdec Ag Structured catalysts for selective reduction of nitrogen oxides by ammonia using a compound that can be hydrolyzed to ammonia
US20040101464A1 (en) * 2002-11-21 2004-05-27 Burton Brooks Method of quantitatively producing ammonia from urea
US20040201142A1 (en) * 2003-04-14 2004-10-14 Robert Rumen Injection lance for uniformly injecting a steam/ammonia mixture into a fossil fuel combustion stream
WO2007099372A1 (en) * 2006-03-01 2007-09-07 Johnson Matthey Public Limited Company Ammonia precursor conversion reactor
US20070246411A1 (en) * 2006-04-25 2007-10-25 Pierre Milhas Pollution-reducer device, a motor vehicle fitted with such a device, and a corresponding pipe
FR2900063A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio Pollution e.g. nitrogen oxide, reduction device for internal combustion heat engine of e.g. car, has pipe including inner tube compressible based on rate adapted to compensate fluid dilatation and with heating element to heat fluid
US20080050297A1 (en) * 2006-08-22 2008-02-28 Babcock Power, Inc. Thermal Decomposition of Urea in a Side Stream of Combustion Flue Gas Using a Regenerative Heat Exchanger
US20080267837A1 (en) * 2007-04-27 2008-10-30 Phelps Calvin E Conversion of urea to reactants for NOx reduction
US20080286165A1 (en) * 2004-05-05 2008-11-20 Graupner Robert K Guanidine Based Composition and System for Same
EP2011559A1 (en) 2007-07-02 2009-01-07 Lab Sa Method of purifying combustion fumes containing nitrogen oxides
WO2009029529A2 (en) * 2007-08-24 2009-03-05 Powerspan Corp. Method and apparatus for producing ammonium carbonate from urea
US20090148370A1 (en) * 2007-12-06 2009-06-11 Spencer Iii Herbert W Process to produce ammonia from urea
US20090211232A1 (en) * 2008-02-25 2009-08-27 Basf Catalysts Llc Emission Treatment Systems and Methods Using Passivated Surfaces
US20090229254A1 (en) * 2008-03-17 2009-09-17 Cummins Filtrations Ip, Inc. Flow reversal chambers for increased residence time
US20090324453A1 (en) * 2008-06-25 2009-12-31 Cummins Filtration Ip, Inc. Catalytic Devices for Converting Urea to Ammonia
US20100146948A1 (en) * 2008-12-17 2010-06-17 Caterpillar Inc. Exhaust system promoting decomposition of reductants into gaseous products
US20100319542A1 (en) * 2007-07-12 2010-12-23 Powerspan Corp. Scrubbing of ammonia with urea ammonium nitrate solution
US20110125326A1 (en) * 2008-07-29 2011-05-26 Powerspan Corp. Using raman spectroscppy to control carbonate/bicarbonate concentrations
WO2012123380A2 (en) 2011-03-11 2012-09-20 Puregeneration (Uk) Ltd Production and use of cyanoguanidine and cyanamide
US8388920B2 (en) 2010-04-02 2013-03-05 Ohio University Selective catalytic reduction via electrolysis of urea
US8562929B2 (en) 2010-04-02 2013-10-22 Ohio University Selective catalytic reduction via electrolysis of urea
US9586831B2 (en) 2014-06-09 2017-03-07 Wahlco, Inc. Urea to ammonia process
US20170283371A1 (en) * 2014-09-05 2017-10-05 Casale Sa Process for production of ammonia and derivatives, in particular urea
EP3260776A1 (en) 2016-06-20 2017-12-27 Steinmüller Engineering GmbH Lance system, boiler- containing lance system and method for reducing nox
US20180017252A1 (en) * 2015-01-20 2018-01-18 General Electric Technology Gmbh Arrangement of a combustor and a device for selective non catalytic reduction and injection nozzle
US9896980B2 (en) 2011-07-26 2018-02-20 Paccar Inc Exhaust aftertreatment supplying a reducing agent
WO2018232293A1 (en) * 2017-06-16 2018-12-20 Watlow Electric Manufacturing Company Temperature-based control of reagent distribution
EP3428534A1 (en) 2017-07-13 2019-01-16 Steinmüller Engineering GmbH Highly heat resistant, highly erosion resistant lance system, reaction space containing the lance system and method for reducing the concentration of pollutants in combustion gases
EP3650756A1 (en) 2018-11-07 2020-05-13 Steinmüller Engineering GmbH Demounatble lance system
CN111249906A (en) * 2020-03-16 2020-06-09 西安西热锅炉环保工程有限公司 Metering distribution system and method for urea direct injection pyrolysis process
CN111715067A (en) * 2020-06-11 2020-09-29 国家能源菏泽发电有限公司 SCR system-based three-field multi-parameter composite ammonia spraying optimization technology
US10844763B2 (en) 2017-03-10 2020-11-24 R. F. Macdonald Co. Process for direct urea injection with selective catalytic reduction (SCR) for NOx reduction in hot gas streams and related systems and assemblies
CN113398748A (en) * 2021-05-10 2021-09-17 高明超 SNCR (selective non-catalytic reduction) system of cement kiln
CN113788484A (en) * 2021-10-11 2021-12-14 西安热工研究院有限公司 Urea hydrolysis product gas purification system and method
CN113877391A (en) * 2020-07-01 2022-01-04 中冶长天国际工程有限责任公司 Composite additive for selective non-catalytic reduction denitration of flue gas and preparation method and application thereof
CN114436291A (en) * 2022-02-16 2022-05-06 西安西热锅炉环保工程有限公司 Heating system and method for preparing ammonia through urea hydrolysis reaction

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6063350A (en) * 1997-04-02 2000-05-16 Clean Diesel Technologies, Inc. Reducing nox emissions from an engine by temperature-controlled urea injection for selective catalytic reduction
JPH11171535A (en) * 1997-12-05 1999-06-29 Mitsubishi Heavy Ind Ltd Method for generating ammonia and exhaust gas treatment using ammonia generated therewith.
WO1999056858A2 (en) * 1998-04-30 1999-11-11 Siemens Aktiengesellschaft Method and device for catalytic reduction of nitrogen oxide
US20030072698A1 (en) * 2000-08-28 2003-04-17 Macarthur Brian W. Apparatus for removing contaminants in reactors
US20030211024A1 (en) * 2002-05-10 2003-11-13 Wojichowski David Lee Methods of converting urea to ammonia for SCR, SNCR and flue gas conditioning
DE602005003234T2 (en) 2004-07-12 2008-08-28 Cardinal Cg Co., Eden Prairie MAINTENANCE-FREE COATINGS
US7275366B2 (en) * 2004-09-14 2007-10-02 Advanced Cleanup Technologies, Inc. High thermal efficiency Selective Catalytic Reduction (SCR) system
US20070048204A1 (en) * 2005-09-01 2007-03-01 Rahul Mital Flash injector for NH3-SCR NOx aftertreatment
EP2013150B1 (en) 2006-04-11 2018-02-28 Cardinal CG Company Photocatalytic coatings having improved low-maintenance properties
US20080011599A1 (en) 2006-07-12 2008-01-17 Brabender Dennis M Sputtering apparatus including novel target mounting and/or control
KR101512166B1 (en) 2007-09-14 2015-04-14 카디날 씨지 컴퍼니 Low-maintenance coating technology
US8808415B2 (en) 2008-02-01 2014-08-19 Sal Caro Exhaust intake bonnet (EIB) for maritime emissions control system
US8075651B2 (en) * 2009-01-21 2011-12-13 Sal Caro Ellipsoid exhaust intake bonnet (EIB) for maritime emissions control system
US8402746B2 (en) 2010-05-03 2013-03-26 John Powell Exhaust gas capture system for ocean going vessels
WO2012104205A1 (en) 2011-02-04 2012-08-09 Paul Scherrer Institut Ammonia generator converting liquid ammonia precursor solutions to gaseous ammonia for denox-applications using selective catalytic reduction of nitrogen oxides
DE112013004154T5 (en) 2012-08-24 2015-05-13 Cummins Ip, Inc. Injection and mixing system for reducing agent
US9429060B2 (en) 2013-10-28 2016-08-30 Cummins Emission Solutions Inc. Systems and methods for control of engine NOx emissions using liquid and dry reductant sources
CN105854548A (en) * 2016-04-15 2016-08-17 廖引家 Cement denitration method
US10267196B1 (en) 2016-09-14 2019-04-23 Southwest Research Institute Treatment of reductant urea solutions with catalyst precursors to assist selective catalytic reduction
WO2018093985A1 (en) 2016-11-17 2018-05-24 Cardinal Cg Company Static-dissipative coating technology
US10378411B1 (en) 2018-01-03 2019-08-13 Southwest Research Institute Dosing method and apparatus for reductant urea solutions with catalyst precursors to assist selective catalytic reduction
US10774715B1 (en) 2018-03-27 2020-09-15 Southwest Research Institute Stabilization of aqueous urea solutions containing organometallic catalyst precursors
US10683787B2 (en) 2018-11-08 2020-06-16 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system having onboard ammonia reactor with hybrid heating
US10876454B2 (en) 2018-11-08 2020-12-29 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system with multi-reductant injection and doser controls
US10767529B2 (en) 2018-11-08 2020-09-08 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system having onboard ammonia reactor with heated doser
US11193413B2 (en) 2019-12-12 2021-12-07 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with virtual temperature determination and control
US11319853B2 (en) 2020-03-31 2022-05-03 Faurecia Emissions Control Technologies, Usa, Llc Automotive exhaust aftertreatment system with doser
US11022014B1 (en) 2020-04-28 2021-06-01 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with heated flash-boiling doser
US11511239B2 (en) 2020-04-29 2022-11-29 Faurecia Emissions Control Technologies, Usa, Llc Heated flash-boiling doser with integrated helix
US11092054B1 (en) 2020-04-29 2021-08-17 Faurecia Emissions Control Technologies, Usa, Llc Flash-boiling doser with thermal transfer helix
US11384667B2 (en) 2020-05-29 2022-07-12 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with heated dosing control
US11225894B1 (en) 2020-06-30 2022-01-18 Faurecia Emissions Control Technologies, Usa, Llc Exhaust aftertreatment system with thermally controlled reagent doser

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900554A (en) * 1973-03-16 1975-08-19 Exxon Research Engineering Co Method for the reduction of the concentration of no in combustion effluents using ammonia
US4124629A (en) * 1975-10-14 1978-11-07 Union Oil Company Of California Thermally stable coprecipitated catalysts useful for methanation and other reactions
US4208386A (en) * 1976-03-03 1980-06-17 Electric Power Research Institute, Inc. Urea reduction of NOx in combustion effluents
US4018769A (en) * 1976-05-17 1977-04-19 Union Oil Company Of California Urea cyanurate manufacture
US4087513A (en) * 1977-08-12 1978-05-02 Olin Corporation Method of hydrolyzing urea contained in waste water streams
US4220635A (en) * 1978-03-20 1980-09-02 Olin Corporation Catalytic method for hydrolyzing urea
US4168299A (en) * 1978-03-20 1979-09-18 Olin Corporation Catalytic method for hydrolyzing urea
US4915036A (en) * 1988-02-26 1990-04-10 Fuel Tech, Inc. Boiler and injector for reducing the concentration of pollutants in an effluent
JPH02191528A (en) * 1989-01-20 1990-07-27 Babcock Hitachi Kk Denitrification device with solid reducing agent utilized therefor
WO1991000134A1 (en) * 1989-07-04 1991-01-10 Fuel Tech Europe Limited Lance-type injection apparatus for introducing chemical agents into flue gases
US4978514A (en) * 1989-09-12 1990-12-18 Fuel Tech, Inc. Combined catalytic/non-catalytic process for nitrogen oxides reduction
US5139754A (en) * 1989-09-12 1992-08-18 Fuel Tech, Inc. Catalytic/non-catalytic combination process for nitrogen oxides reduction
US4997631A (en) * 1990-03-07 1991-03-05 Fuel Tech, Inc. Process for reducing nitrogen oxides without generating nitrous oxide
US5240688A (en) * 1990-08-01 1993-08-31 Fuel Tech Gmbh Process for the in-line hydrolysis of urea

Cited By (97)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5601792A (en) * 1992-02-24 1997-02-11 Hug; Hans T. Cleaning exhaust gases from combustion installations
US5431893A (en) * 1992-02-24 1995-07-11 Hug; Hans T. Cleaning exhaust gases from combustion installations
US5585072A (en) * 1995-01-27 1996-12-17 The Babcock And Wilcox Company Retractable chemical injection system
US5943858A (en) * 1995-05-19 1999-08-31 Siemens Aktiengesellschaft Premixing chamber for an exhaust gas purification system
WO1997036676A1 (en) * 1996-04-02 1997-10-09 Clean Diesel Technologies, Inc. Method and apparatus for reducing harmful emissions from a diesel engine by urea injection scr
US5681536A (en) * 1996-05-07 1997-10-28 Nebraska Public Power District Injection lance for uniformly injecting anhydrous ammonia and air into a boiler cavity
WO1998022209A1 (en) * 1996-11-20 1998-05-28 Clean Diesel Technologies, Inc. SELECTIVE CATALYTIC NOx REDUCTION UTILIZING UREA WITHOUT CATALYST FOULING
WO1998028070A1 (en) * 1996-12-20 1998-07-02 Clean Diesel Technologies, Inc. Method and apparatus for reducing harmful emissions from a lean-burn engine by urea injection scr
US6322762B1 (en) 1997-03-21 2001-11-27 Ec & C Technologies Method using on site generated ammonia to reduce particulates
EP1417996A2 (en) * 1997-03-21 2004-05-12 EC & C Technologies, Inc. Methods for the production of amonia from urea and uses thereof
US6506350B2 (en) 1997-03-21 2003-01-14 Ec&C Technologies, Inc. Method using on site generated ammonia to reduce particulates in combustion gas streams
US6730280B2 (en) 1997-03-21 2004-05-04 Ec&C Technologies, Inc. Methods for the production of ammonia from urea and/or biuret, and uses for NOx and/or particulate matter removal
WO1998042623A1 (en) * 1997-03-21 1998-10-01 Ec&C Technologies Methods for the production of ammonia from urea and uses thereof
US7220395B2 (en) 1997-03-21 2007-05-22 Ec&C Technologies, Inc. Methods for the production of ammonia from urea and/or biuret, and uses for NOx and/or particulate matter removal
EP1417996A3 (en) * 1997-03-21 2004-11-24 EC & C Technologies, Inc. Methods for the production of amonia from urea and uses thereof
US20040126294A1 (en) * 1997-03-21 2004-07-01 Cooper Hal B.H. Methods for the production of ammonia from urea and/or biuret, and uses for NOx and/or particulate matter removal
US6361754B1 (en) * 1997-03-27 2002-03-26 Clean Diesel Technologies, Inc. Reducing no emissions from an engine by on-demand generation of ammonia for selective catalytic reduction
WO1998043732A1 (en) * 1997-04-02 1998-10-08 Clean Diesel Technologies, Inc. REDUCING NOx EMISSIONS FROM AN ENGINE BY TEMPERATURE-CONTROLLED UREA INJECTION
US5976475A (en) * 1997-04-02 1999-11-02 Clean Diesel Technologies, Inc. Reducing NOx emissions from an engine by temperature-controlled urea injection for selective catalytic reduction
CN1124176C (en) * 1997-04-02 2003-10-15 克林迪塞尔技术公司 Reducing NOx emissions from an engine by temperature-controlled urea injection
US6616901B1 (en) * 1998-10-16 2003-09-09 Hera, Llc Apparatus for pollution control in exhaust gas streams from fossil fuel burning facilities
US6093380A (en) * 1998-10-16 2000-07-25 Siirtec Nigi, S.P.A. Method and apparatus for pollution control in exhaust gas streams from fossil fuel burning facilities
US6146605A (en) * 1999-07-26 2000-11-14 Hera, Llc Combined SCR/SNCR process
US6403046B1 (en) 1999-07-26 2002-06-11 Hera, Llc Pollution control systems using urea and ammonia for the control of emissions from the flue gas of fossil fuel burning facilities
US7291313B2 (en) 2000-02-28 2007-11-06 Miura Co., Ltd. NOx removal system for boilers
US20050152822A1 (en) * 2000-02-28 2005-07-14 Miura Co., Ltd. NOx removal system for boilers
US20010018034A1 (en) * 2000-02-28 2001-08-30 Satoshi Wakasa Ammonia generating apparatus
US20010018033A1 (en) * 2000-02-28 2001-08-30 Satoshi Wakasa NOx removal system for boilers
US6713031B2 (en) * 2000-05-10 2004-03-30 Dmc2 Degussa Metal Catalysts Cerdec Ag Structured catalysts for selective reduction of nitrogen oxides by ammonia using a compound that can be hydrolyzed to ammonia
US6511644B1 (en) 2000-08-28 2003-01-28 The Chemithon Corporation Method for removing contaminants in reactors
US6436359B1 (en) 2000-10-25 2002-08-20 Ec&C Technologies, Inc. Method for controlling the production of ammonia from urea for NOx scrubbing
US6761868B2 (en) 2001-05-16 2004-07-13 The Chemithon Corporation Process for quantitatively converting urea to ammonia on demand
US7008603B2 (en) 2001-05-16 2006-03-07 The Chemithon Corporation Process and apparatus for quantitatively converting urea to ammonia on demand
US20040208813A1 (en) * 2001-05-16 2004-10-21 The Chemithon Corporation Apparatus for quantitatively converting urea to ammonia on demand
US20030031604A1 (en) * 2001-05-16 2003-02-13 Burton Brooks Processes and apparatus for quantitatively converting urea to ammonia on demand
WO2002092512A1 (en) * 2001-05-16 2002-11-21 The Chemithon Corporation Processes and apparatus for quantitatively converting urea to ammonia on demand
US20050207961A1 (en) * 2001-05-16 2005-09-22 The Chemithon Corporation Process and apparatus for quantitatively converting urea to ammonia on demand
US6887284B2 (en) 2002-07-12 2005-05-03 Dannie B. Hudson Dual homogenization system and process for fuel oil
US20040006911A1 (en) * 2002-07-12 2004-01-15 Hudson Dannie B. Dual homogenization system and process for fuel oil
US20040101464A1 (en) * 2002-11-21 2004-05-27 Burton Brooks Method of quantitatively producing ammonia from urea
US6887449B2 (en) 2002-11-21 2005-05-03 The Chemithon Corporation Method of quantitatively producing ammonia from urea
US20040201142A1 (en) * 2003-04-14 2004-10-14 Robert Rumen Injection lance for uniformly injecting a steam/ammonia mixture into a fossil fuel combustion stream
US20080286165A1 (en) * 2004-05-05 2008-11-20 Graupner Robert K Guanidine Based Composition and System for Same
WO2007099372A1 (en) * 2006-03-01 2007-09-07 Johnson Matthey Public Limited Company Ammonia precursor conversion reactor
US20070246411A1 (en) * 2006-04-25 2007-10-25 Pierre Milhas Pollution-reducer device, a motor vehicle fitted with such a device, and a corresponding pipe
FR2900063A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio Pollution e.g. nitrogen oxide, reduction device for internal combustion heat engine of e.g. car, has pipe including inner tube compressible based on rate adapted to compensate fluid dilatation and with heating element to heat fluid
FR2900217A1 (en) * 2006-04-25 2007-10-26 Nobel Plastiques Soc Par Actio FLUID TRANSPORT HOSE WITH COMPRESSIBLE COMPENSATION MEMBER AND FLUID TRANSPORT CIRCUIT STRING.
US20080050297A1 (en) * 2006-08-22 2008-02-28 Babcock Power, Inc. Thermal Decomposition of Urea in a Side Stream of Combustion Flue Gas Using a Regenerative Heat Exchanger
US7682586B2 (en) 2006-08-22 2010-03-23 Babcock Power Environmental, Inc. Thermal decomposition of urea in a side stream of combustion flue gas using a regenerative heat exchanger
US20080267837A1 (en) * 2007-04-27 2008-10-30 Phelps Calvin E Conversion of urea to reactants for NOx reduction
US20100015029A1 (en) * 2007-04-27 2010-01-21 Babcock Power Envoronmental Inc. Conversion of urea to reactants for nox reduction
US8017100B2 (en) 2007-04-27 2011-09-13 Babcock Power Environmental Inc. Conversion of urea to reactants for NOx reduction
RU2469949C2 (en) * 2007-07-02 2012-12-20 Лаб Са Method of purifying smoke gases, containing nitrogen oxides
EP2011559A1 (en) 2007-07-02 2009-01-07 Lab Sa Method of purifying combustion fumes containing nitrogen oxides
US20100319542A1 (en) * 2007-07-12 2010-12-23 Powerspan Corp. Scrubbing of ammonia with urea ammonium nitrate solution
WO2009029529A3 (en) * 2007-08-24 2009-07-23 Powerspan Corp Method and apparatus for producing ammonium carbonate from urea
WO2009029529A2 (en) * 2007-08-24 2009-03-05 Powerspan Corp. Method and apparatus for producing ammonium carbonate from urea
US20110110841A1 (en) * 2007-08-24 2011-05-12 Powerspan Corp Method and apparatus for producing ammonium carbonate from urea
US20110076222A1 (en) * 2007-12-06 2011-03-31 EC&C Technologies, Inc Process to Produce Ammonia from Urea
US20090148370A1 (en) * 2007-12-06 2009-06-11 Spencer Iii Herbert W Process to produce ammonia from urea
US8313722B2 (en) 2007-12-06 2012-11-20 Ec&C Technologies, Inc. Process to produce ammonia from urea
US8776499B2 (en) 2008-02-25 2014-07-15 Basf Corporation Emission treatment systems and methods using passivated surfaces
US20090211232A1 (en) * 2008-02-25 2009-08-27 Basf Catalysts Llc Emission Treatment Systems and Methods Using Passivated Surfaces
US7856807B2 (en) 2008-03-17 2010-12-28 Cummins Filtration Ip, Inc. Flow reversal chambers for increased residence time
US20090229254A1 (en) * 2008-03-17 2009-09-17 Cummins Filtrations Ip, Inc. Flow reversal chambers for increased residence time
US8071037B2 (en) 2008-06-25 2011-12-06 Cummins Filtration Ip, Inc. Catalytic devices for converting urea to ammonia
US20090324453A1 (en) * 2008-06-25 2009-12-31 Cummins Filtration Ip, Inc. Catalytic Devices for Converting Urea to Ammonia
US20110125326A1 (en) * 2008-07-29 2011-05-26 Powerspan Corp. Using raman spectroscppy to control carbonate/bicarbonate concentrations
US20100146948A1 (en) * 2008-12-17 2010-06-17 Caterpillar Inc. Exhaust system promoting decomposition of reductants into gaseous products
RU2538368C2 (en) * 2010-04-02 2015-01-10 Огайо Юниверсити Selective catalytic reduction by urea electrolysis
US8388920B2 (en) 2010-04-02 2013-03-05 Ohio University Selective catalytic reduction via electrolysis of urea
US8562929B2 (en) 2010-04-02 2013-10-22 Ohio University Selective catalytic reduction via electrolysis of urea
WO2012123380A2 (en) 2011-03-11 2012-09-20 Puregeneration (Uk) Ltd Production and use of cyanoguanidine and cyanamide
WO2012123378A1 (en) 2011-03-11 2012-09-20 Puregeneration (Uk) Ltd Production and use of cyanoguanidine and cyanamide
US9896980B2 (en) 2011-07-26 2018-02-20 Paccar Inc Exhaust aftertreatment supplying a reducing agent
US9586831B2 (en) 2014-06-09 2017-03-07 Wahlco, Inc. Urea to ammonia process
US20170283371A1 (en) * 2014-09-05 2017-10-05 Casale Sa Process for production of ammonia and derivatives, in particular urea
US10954187B2 (en) * 2014-09-05 2021-03-23 Casale Sa Process for production of ammonia and derivatives, in particular urea
US20180017252A1 (en) * 2015-01-20 2018-01-18 General Electric Technology Gmbh Arrangement of a combustor and a device for selective non catalytic reduction and injection nozzle
US10563862B2 (en) * 2015-01-20 2020-02-18 General Electric Company Arrangement of a combustor and a device for selective non catalytic reduction and injection nozzle
EP3260776A1 (en) 2016-06-20 2017-12-27 Steinmüller Engineering GmbH Lance system, boiler- containing lance system and method for reducing nox
WO2017220571A1 (en) 2016-06-20 2017-12-28 Steinmüller Engineering GmbH Lance system, boiler containing lance system and method for nox reduction
US11242789B2 (en) 2017-03-10 2022-02-08 R. F. Macdonald Co. Process for direct urea injection with selective catalytic reduction (SCR) for NOx reduction in hot gas streams and related systems and assemblies
US10844763B2 (en) 2017-03-10 2020-11-24 R. F. Macdonald Co. Process for direct urea injection with selective catalytic reduction (SCR) for NOx reduction in hot gas streams and related systems and assemblies
WO2018232293A1 (en) * 2017-06-16 2018-12-20 Watlow Electric Manufacturing Company Temperature-based control of reagent distribution
US11047281B2 (en) 2017-06-16 2021-06-29 Watlow Electric Manufacturing Company Temperature-based control of reagent distribution
EP3428534A1 (en) 2017-07-13 2019-01-16 Steinmüller Engineering GmbH Highly heat resistant, highly erosion resistant lance system, reaction space containing the lance system and method for reducing the concentration of pollutants in combustion gases
EP3650756A1 (en) 2018-11-07 2020-05-13 Steinmüller Engineering GmbH Demounatble lance system
CN111249906A (en) * 2020-03-16 2020-06-09 西安西热锅炉环保工程有限公司 Metering distribution system and method for urea direct injection pyrolysis process
CN111715067A (en) * 2020-06-11 2020-09-29 国家能源菏泽发电有限公司 SCR system-based three-field multi-parameter composite ammonia spraying optimization technology
CN111715067B (en) * 2020-06-11 2022-08-16 国家能源菏泽发电有限公司 SCR system-based three-field multi-parameter composite ammonia spraying optimization system
CN113877391A (en) * 2020-07-01 2022-01-04 中冶长天国际工程有限责任公司 Composite additive for selective non-catalytic reduction denitration of flue gas and preparation method and application thereof
CN113877391B (en) * 2020-07-01 2023-12-29 中冶长天国际工程有限责任公司 Composite additive for selective non-catalytic reduction denitration of flue gas, preparation method and application thereof
CN113398748A (en) * 2021-05-10 2021-09-17 高明超 SNCR (selective non-catalytic reduction) system of cement kiln
CN113788484A (en) * 2021-10-11 2021-12-14 西安热工研究院有限公司 Urea hydrolysis product gas purification system and method
CN114436291A (en) * 2022-02-16 2022-05-06 西安西热锅炉环保工程有限公司 Heating system and method for preparing ammonia through urea hydrolysis reaction
CN114436291B (en) * 2022-02-16 2023-11-10 西安西热锅炉环保工程有限公司 Heat supply system and method for preparing ammonia through urea hydrolysis reaction

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